Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1e73836c78e780…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 00:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc8abda3564bd54ef8aa22b65089f765 SHA-1: cb1c35b1103fa15df098bc574c885123c2a1f213 SHA-256: ea1e73836c78e780698a97c9563bf7c72e007f61a54489bf7930bbae24f24221
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The embedded URLs lead to various domains, many of which are associated with compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9394932538---vaxuwedafatuxogotamemezo.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4162e6708d---55985608623.pdf
    • http://nktrading.qa/file/files/33733630979.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a59072c9d36---firegu.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093fad2cb0de---59812711725.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c5f166a8a---70921023643.pdf
    • https://delcinfo.ru/img/files/files/jibezesebopozajutexos.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16076500394efd---voboxoberumozi.pdf
    • http://davidlbrooks.com/clients/868292/File/tidav.pdf
    • https://henklinders.nl/henklinders/upload/files/sifaju.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4ad2280f3a4edf7dbba5caa06365ca0e/gabawutofogaron.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/kasukobiposepoforumaz.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c505f3f3399---xonutokomabivusuwoj.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608567b392a5b---72751464909.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/01u8g7lk92bu5qhdqa4bu6mke1/rararosuzivixibupi.pdf
    • http://stardentalcare.org/userfiles/file/jenumina.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/94c260f03282cd7b19515154e024a544/kenisebodalukibemego.pdf
    • https://ambalatender.com/upload/files/61491023773.pdf
    • https://sambelteri.com/contents//files/46097383430.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9bb1bb0f0fc0177af05f2d237c34a203/81188485906.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b2e70c6f---18708696801.pdf
    • http://orchid-daikanyama.com/userfiles/file/widobarujubewitisig.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b31cd81e6---25346574262.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a75972509---nikiwakogozunegojixuwalox.pdf
    • http://harc-ias.vn/Images_upload/files/museren.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=jaden+and+willow+smith
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f700.bin
d23fac3daa14a902fef064205dcf571edc5968a488568235b0d7a73f23458aec
pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 10488 bytes
font_01_sfnt_off00010eab.bin
f8d7496486bcaac7da2e3bdbb030b39d93fdc9a14f29fbf8122202852f32bf91
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAB 17496 bytes
font_02_sfnt_off00013c59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C59 16792 bytes